Br contained alkyl ammonium salt enabled scalable fabrication of high quality perovskite films for efficient and stable perovskite modules
Developing new processing techniques with high reliability in large-scale fabrication is considered to be the most critical issue for organic-inorganic halide perovskites photovoltaics while towards the potential commercialization in the next few years. Here, the incorporation of Br contained tetrabutylammonium salt (TBAB) into the perovskite precursors demonstrates the superior advantage in both crystallization and large-area uniformity control during the scalable blade-coating for perovskite films. By this facile approach, significantly increased repeatability in device performance and efficient large-area 16-cm2-four-cell modules with best-efficiency up to 15.79% was achieved. More importantly, the surficial modification with the alkyl ammonium cations enabled the long-term stability for the MAPbI3 based perovskite films and modules, resulting the fabricated modules can retain >89% of the initial PCE after 1000 h ageing. This research presents a facile way to achieve the synergistic effect of crystalizing tailoring, uniformity control and surface passivation based on the Br contained molecular modification strategy for perovskite films, leading to the significantly improved efficiency, stability and fabrication reliability for PSC modules.